Polyurethanes containing amino organosilane modified clay



United States Patent "ice 3,390,120 POLYURETHANES CONTAINING AMINO ORGANOSILANE MODIFIED CLAY Joseph Iannicelli, Macon, Ga., assignor to J. M. Huber Corporation, Locust, N.J., a corporation of New Jersey No Drawing. Continuation-impart of application Ser. No.

269,695, Apr. 1, 1963. This application Aug. 16, 1965,

Ser. No. 480,090

3 Claims. (Cl. 260-37) ABSTRACT OF THE DISCLOSURE The instant disclosure is directed to the polyurethane polymer compositions which are filled with a kaolin clay which has been modified with from 1% to 3% of an amino organosilane. The modulus and tear resistance of the polymers is improved without degradation of the remaining properties.

This invention relates to polyurethane polymer compositions containing finely divided amino organosilane modified kaolin clay fillers.

The present application is a continuation-impart of applicants copendingapplication Ser. No. 269,695, filed Apr. 1, 1963, now Patent No. 3,290,165, entitled, Surface Modified Pigments, which in turn is a continuationin-part of applicants application Ser. No. 189,321, filed Apr. 23, 1962, enti-ltled, Surface Modified Pigments, now abandoned.

Polyurethane polymer compositions can be formed from a variety of polymers, l.e., thermosetting gums, thermoplastic polymers and liquid or casting polymers. The preparations for various classes and grades of polyurethanes are well known in the art and need not be detailed here; however, the general reaction by which they are formed is by a chain extension process rather than the usual polymerization reaction. In this process a relatively short chain polymer, either a polyester or a polyether, is reacted with an organic diisocyanate to form long chain urethane polymer. The process variations and polymerization variations caused thereby result in a multitude of compositions all broadly falling in one of the three classes mentioned.

The polyurethanes have several outstanding properties which make them desirable products, chief among them is abrasion resistance, good low temperature characteristics, good resistance to heat deterioration, ozone cracking, weathering, and oil or solvent swelling.

Thermosetting gum vulcanizates have a variety of uses in conveyor belts, roll covers, sandblast-hose tubes and other applications where good abrasion resistance is needed.

Thermoplastic resins can be processed on standard extrusion, injection molding, and transfer molding equipment. These resins are useful in small parts such as mallet heads, sprocket gears, adhesive coatings and unsupported sheetings such as fuel tanks, tarpaulins and chute liners.

Liquid polyurethane valcanizates exhibit good abrasion resistance, non-marking and a wide range of hardnesses. These products have use in large rolls for the steel industry, fork lift truck wheels, ladies toplifts, ball-joint seals, automotive seals, potting compounds, conveyor belts, V-belts, and tank linings.

Despite the fact that the polyurethanes have outstanding properties and are suitable for a large variety of uses, industry is constantly attempting to improve them by various means. Properties which are desirable to im- 3,390,120 Patented June 25, 1968 prove are modulus, tear resistance, hardness and abrasion resistance. In many cases reinforcing fillers have been tried but on the whole, while some improvements resulted, the degradation of other properties resulted and a completely satisfactory filler has not been found.

It is an object of this invention to provide solid polyprethane vulcanizates and thermoplastic resin compositions containing reinforcing fillers .of modified kaolin clays.

Other objects and advantages will be apparent from the following specification.

I have discovered that kaolin clay modified with saturated amino organosilanes are reinforcing fillers for polyurethane polymers and impart improved properties to them. Particularly, modulus and tear resistance are improved with little, if any, degradation of other important properties.

The kaoline clays which are suitable as substrates for the modifier are refined clays of the rubber and paper grades.

The modified kaolin clays can be prepared by dissolving the desired amount of amino organosilane in a suitable solvent, adding the pigment and heating until the reaction is complete. The amount of modifier added depends upon the specific modifier used and the intended polymer to be reinforced. Generally from 1% to 3% by weight of the modifier is sufiicient for most purposes.

A particularly useful process for modifying the kaolin clay involves spray drying kaolin slurries having one or more of the amino organosilanes dispersed therein. The spray drying process effects a uniform distribution of the modifier on the kaolin. Another satisfactory method of modifying the kaolin involves dissolving the desired amount of amino organosilane in a suitable solvent, add ing the kaolin and heating until the reaction is complete.

The compounds used to modify the kaolin clays can be depicted by the formula:

wherein R is hydrogen, alkyl, aryl, cycloalkyl, or alkylaryl; R is hydrogen, alkyl, aryl, cycloalkyl, or alkylaryl; R is hydrogen, lower alkyl, aryl, lower alkylaryl, or lower arylalkyl; R is hydrogen, lower alkyl, aryl, lower alkylaryl, or lower arylalkyl; R is hydrogen, lower alkyl, aryl, lower alkylaryl, or lower arylalkyl; and X is alkylene, alkylene containing secondary amino nitrogen, alkylene containing tertiary amino nitrogen, arylene, arylene containing secondary amino nitrogen, arylene containing tertiary amino nitrogen, alkylarylene, alkylarylene containing secondary amino nitrogen, alkylarylene containing tertiary amino nitrogen, arylalkylene, arylalkylene containing secondary amino nitrogen, arylalkylene containing tertiary amino nitrogen, cycloa-lkylene, cycloalkylene containing secondary amino nitrogen and cycloalkylene con taining tertiary amino nitrogen. Some of these amino organosilanes are disclosed along with methods for their preparation in US. Patents Nos. 2,832,754, 2,930,809, 3,007,957, and 3,020,302. Commercially available amino organo silanes useful in the practice of this invention include A-llOO, a gamma-aminopropyltriethoxy silane (GAPTS), and Y-2967, an amino organosilane which is a modified 'gamma-amin'opropyltriethoxy silane, sold by Union Carbide Corporation, New York, N.Y., Z-6020, a diamino functional silane, sold by Dow Corning Corporation, Midland, Michigan.

Representative commercially available poly-urethane polymers suitable for use in this invention are Vibrathane 5003, a thermosetting gum which is cross-linked, produced by Naugatuck Chemical Division of US. Rubber Company; Elastothane 455, a thermosetting gum which is cross-linked, produced by Thiok-ol; Genthane S, a cross-linked thermosetting gum produced by General Chemical; Estane, a thermoplastic resin produced by B. F. Goodrich Chemical; Texin," a thermoplastic resin produced by Mo bay; Multrathane, a liquid polymer produced by Mobay; Cyanoprene 4590, a liquid polymer produced by American Cyanamid; Adiprene L, produced by Du Pont; Vibrathane 6000, produced by Naugatuck; and Neothane, produced by Goodyear.

In the following formulations the gums were mill-mixed or Banbury-mixed and the thermoplastic resins were millmixed and injection molded.

The resin was molded at 390410 F. and was not post cured. The results are shown in Table III.

TABLE III 0.25% 0.5% 1% Control Kaolin GAPTS GAPTS GAPTS on Kaolin on Kaolin on Kaolin Parts Filler/100 parts Polymer"... 0 2O 20 20 Stress 300%, .s.i 1, 090 1,680 1, 725 1, 735 1, 720 Tensile, p.s.i 4, 380 4, 470 .3, 340 4, 250 4, 400 Elongation, percent" 610 640 560 655 595 Shore A Hardness 85 88 88 88 88 The following formulations illustrate this invention. Example IV Parts Example I Parts Estane 5701 100 Barium stearate 3 V1br-athane 5003 1 0 Stearic acid 025 Modified clay 25 or 50 Di p 40C (py agent) 5 The resin was molded 5' at 350 F, held in the mold Filler (modified clay) 60 under pressure until the temperature dropped below 200 The compounds were mixed on a 6 inch by 12 inch F. The results are tabulated in Table IV.

laboratory mill and cured for 30 minutes at 307 F., ex- TABLE Iv cept for the NBS abrasion test where the cure was for (1 11 Kaollii 15801211683015 minutes at 307 F.

The data tabulated in Table I indicates the results when g a fi P y r u 1 8 1 5 5 1 28 2 28 3 3% l ico 1 6 30 i rasioii n ex, percen 4 5 720 1,285 16, 72 clay i 1% y Welg t 1 e 0 mo 1 n NBS Abrasion ShoreA s2 00 2 0 92 clay is the filler.

TABLE I Control Kaolin GAPTS GAPTS GAPTS Z-6020 on Kaolin on Kaolin on Kaolin on Kaolin Parts Filler/100 parts Polymer None 60 60 60 60 60 Tensile, p.s.i 3, 500 3, 920 3,600 3, 840 3, 270 Stress 300%, p.s.i 1, 040 2, 600 3, 390 2, 520 Elongation, pereent 440 470 350 265 365 Shore A Hardness 58 74 74 74 73 NBS Abrasion, percent of Standard 100 89 134 157 193 Minutes Cured at 305 F 30 30 30 30 30 60 1 N0 cure.

Example II Example V Parts Parts Texin 480A 100 Estane 5701 100 Modified clay 20 Barium stearate 3 Filler 25, 50, or 100 The resin was molded at 390410 F. and post cured at 110 C. for 24 hrs. The results are tabulated in The polymer batch was treated as in Example IV. The

Tabl II, results are shown in Table V.

TAB LE V (20111- Kaolliaolzi i; Kauai Kaolgg Kaolli i; liao- Kaoli i III-201i? Kao- Kaolin Kaolin ro in p us p us p us p us 'n p us 2 p us 1 ]in lus 2 lus 1 oAP'r GAP'I GAPT 2-6020 GAPT S 2-6020 Ends 2402? Parts Filler/100 parts Polymer- 0 25 25 25 25 25 50 50 50 100 100 100 200% Modulus, .s.i 60 1,700 3,500 3,740 300% Modulus, psi 1, 440 1, 780 2, 940 3, 260 3, 040 3, 000 Shore A Hardness- 88 93 91 92 91 91 94 94 95 97 97 97 NBS Abrasion, Index 460 641 827 703 041 746 624 936 568 334 553 575 Example VI Parts Estane 5701 100 Barium Stearate 3 Pigment 25 or 50 The recipe was treated the same as in Example IV. The results are shown in Table VI.

TABLE VI Con- Kaolin plus Kaolin plus trol Kaolin 2% GAPTS 1% Z-6020 Parts Filler/100 parts Polymer None 25 5O 25 50 25 50 300% Modulus, .i 1,220 1,580 1, 040 2, 880 3,600 2, 840 3,300 ASTM Tear Die 0," lbs/in 0 500 500 550 480 500 580 NBS Abrasion, Index percent 492 521 720 1, 015 1, 411 1, 285 1, 672 NBS Abrasion, Shore A Hardness 82 90 92 90 91 90 92 Example VII a filler, modified kaolin clay, said kaolin clay modified Parts with from 1% to 3% by weight with an aminoorgano- Estane 5701 100 silane of the formula Barium Stearate 3 R OR Filler 10, 20, 60 or 100 i N-XSi--OR The recipe was treated as 1n Example IV. The results l i are shown in Table VII. R2

TABLE VII Con- Kaolin Plus Kao- Kaolin Plus Kaotrol 1% 2-6020 lin 1% Z-6020 lin Parts Filler/100 parts Polymer 0 10 20 20 60 100 100 300% Modulus, p.s.i 1,280 2, 040 2, 740 1,040 3,420 2, 040 ASTM Tear "Die 0, lbs./i 420 500 000 530 540 406 510 NBS Abrasion, Index percent- 570 867 1, 095 957 1,722 1, 465 717 NBS Abrasion, Shore A s4 89 94 95 V 05 Example VIII wherein R is selected from the group consisting of hy- Parts drogen, alkyl, aryl, cycloalkyl, and alkaryl, R is selected A dipreqe L 1OO 100 from the group consisting of hydrogen, alkyl, aryl, cyclo- Mfithylene .bis org;ochloraniline 11 l y and alkylaryl, 3 18 selected from the g p Pigment 2O sistmg of hydrogen, lower alkyl, aryl, lower alkylaryl, and

The mixture was cured for 180 minutes at 212 F. The results are shown in Table VIII.

TABLE VIII Kaolin Control Kaolin Plus 1% Parts Filler/100 parts Polymer 0 20 20 300% Modulus, p.s.i 1, 530 1, 940 Tensile, p.s.i 2, 570 1, 310 2, 710 Elongation, Percent 495 285 480 Shore A Hardness .1 87 88 90 ASIM Tear Die C, lb 450 408 505 NBS Abrasion, Index, Percent 224 126 194 lower arylalkyl, R is selected from the group consisting of hydrogen, lower alkyl, aryl, lower alkylaryl, and lower arylalkyl, R is selected from the group consisting of hydrogen, lower alkyl, aryl, lower alkylaryl, and lower arylalkyl, and X is selected from the group consisting of alkylene, arylene, alkylarylene, arylalkylene, cycloalkylene, cycloalkylene containing secondary amino nitrogen and cycloalkylene containing tertiary amino nitrogen.

2. The composition of claim 1 wherein the filler is kaolin clay modified with from 1% to 3% by weight of a diamino functional silane.

3. The composition of claim 1 wherein the filler is kaolin clay modified with 1% to 3% by weight of gammaaminopropyltrieth'oxysilane.

References Cited UNITED STATES PATENTS 2,742,378 4/1956 Te Grotenhuis 106-308 3,015,569 1/1962 Frieser 106308 3,029,209 4/1962 Ferrigno 260-37 3,150,109 9/1964 Ferrigno 260-37 3,328,339 6/1967 Tierney 260-37 MORRIS LIEBMAN, Primary Examiner.

B. A. AMERNICK, Assistant Examiner, 

